DD - There is no letter preceding the number - Just 6539280 - when I input it I get:
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To begin, enter your firearm's serial number:

PLEASE NOTE:
We will be closed for our summer shut-down from June 29th to July 18th. Any orders placed from June 29th to July 18th will be processed and shipped the week of July 18th.

Our apologies...
Serial number entered cannot be found in the system.

Please note: We do not service models manufactured prior to serial number F498821.
Please refer to the warranty and repair page for possible resources for repair and parts for these firearms.

Savage Arms Contact Information
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